Mixing RAM

[novacheck]

I have 2 different sets of RAM. 2x 1gb of Transcend AxeRAM DDR2-800, and 2x 1gb of Corsair DDR2-800. The Axeram has the D9's. I am unsure about the Corsair. They both have the same timing sets. 4-4-4-12 2T. The AxeRAM is 1.8v, however the Corsair is 2.1v. I have absolutely no issues running each set by themselves, but once I try to run both at the same time, the system will not boot. I have tried different voltages for the NB, the RAM. I even tried setting ALL my clocks back to default. However, nothing I do seems to work. Check my stats on left to see my system. Maybe one of you guys can think of something I can't. Thanks.

[AsRock]

Maybe running them at lower timing would help ?

[suraswami]

Put Corsair alone. Set the volts to 1.8V. Relax the timing a bit and see if it boot up and stay stable. Then put the Axeram and boot.

[novacheck]

Yeah, it will boot with each set by themselves. I have also tried pulling timings back as far as 6-6-6-18. And yes, the Corsair will run perfectly fine at 1.8v. This issue has me baffled. I don't see why both sets will work when by themselves, but put them together, no go. They will work at the EXACT same settings individually. But, not together.

[AsRock]

Yeah, it will boot with each set by themselves. I have also tried pulling timings back as far as 6-6-6-18. And yes, the Corsair will run perfectly fine at 1.8v. This issue has me baffled. I don't see why both sets will work when by themselves, but put them together, no go. They will work at the EXACT same settings individually. But, not together.

You put axe's in slot 1 and 2 and corsairs in slot 3 and 4 ? ( and visa Vera ).. Just a thought.

My G Skill PC8000 4GB work great with my Axes 1200 2GB running at 1066. Got the Axes in 1st. Not tried the other way there's been no reason too.

EDIT At a guess you removed the overclock 1st huh ?..

[suraswami]

yeah load bios defaults and then try putting them together. are the memory modules on the mobo recommended list?

[novacheck]

You put axe's in slot 1 and 2 and corsairs in slot 3 and 4 ? ( and visa Vera ).. Just a thought.

My G Skill PC8000 4GB work great with my Axes 1200 2GB running at 1066. Got the Axes in 1st. Not tried the other way there's been no reason too.

EDIT At a guess you removed the overclock 1st huh ?..Yeah, I tried my regular OC, and even pulled everything back down to default. They still won't run together, even at 800mhz. I didn't think to offset them like that. Have the AxeRAM dual channeled with the Corsair? And I had also tried Axeram in first channel, and Corsair in second, and vice versa. Still nothing. May be that they are incompatible? I don't see why, but I am no genius when it comes to PC's

[novacheck]

yeah load bios defaults and then try putting them together. are the memory modules on the mobo recommended list?

Yeah, again, I have ran defaults, and OC. They run fine on their own. And will pass an hour on Memtest.

[Frogger]

why not dl w1zz's spd tool and have a look at the sub timings OR if you got the B*lls ypu could flash one of the stix so they both have the same spd [back up the orginal spd first] but you might Brick the stix ..... it's your call

[suraswami]

if you still have time to return the corsair or the axeram return it and find matching pair and you will be set.

[mon74]

I think they will not run in dual channel, try single channel mode, e.g. slot 1-3, 2-4, not 1-2, 3-4, depending on your motherboard...;)

[novacheck]

Other than voltage, they already have the same SPD. I haven't checked the sub-timings yet, I will do that real quick, and get back to you guys.

[novacheck]

I used Memset to get screenshots. Hopefully this may help. I will install the Corsair in a sec, and get screens of those as well.
http://img.techpowerup.org/080507/Capture012599.jpg

[novacheck]

Okay, don't follow the last screenshot, that one was when I was OC'ed. These next two are at default clocks, running 4-4-4-12, and at default voltage for each set. Axeram=1.8v, Corsair=2.1v.

Corsair
http://img.techpowerup.org/080507/Capture013202.jpg

Transcend
http://img.techpowerup.org/080507/Capture014.jpg





And, I just now looked at these, and I guess that the SPD's are different. I didn't realize that before, but the Corsair does specifically say 4-4-4-12 on the label. The model # if you may need it is in the below picture.

http://img.techpowerup.org/080507/Capture015725.jpg

[novacheck]

Well, since I am unable to get it to work I am going to have to get rid of a set. Which would be the best brand to keep?

[suraswami]

Keep the D9 (Axeram) and get rid of the Corsair.

[Pandaz3]

They don't really have the same SPD, it just appears that they do. Since they are truly widely different in the voltage, they will have other differences too. They are confusicating the Memory controller on the Mobo. I would try a couple of simple bench marks with each set and keep the one that runs my system best.

[DaedalusHelios]

They don't really have the same SPD, it just appears that they do. Since they are truly widely different in the voltage, they will have other differences too. They are confusicating the Memory controller on the Mobo. I would try a couple of simple bench marks with each set and keep the one that runs my system best.

Good idea. See what clocks the best and keep the set that does. ;)

[ElWapo973]

They don't really have the same SPD, it just appears that they do. Since they are truly widely different in the voltage, they will have other differences too. They are confusicating the Memory controller on the Mobo. I would try a couple of simple bench marks with each set and keep the one that runs my system best.

I would do exactly the same. Even though each set of memory has different ICs and in theory one may be technically better than the other, due to any number of variables, there will be varying levels of compatibility from setup to setup and you're better off testing both sets out to confirm which is truly better in your case. :toast:

[DaedalusHelios]

The Corsair DHX might be D9 also.;)

[novacheck]

I would check, but I am a little uncomfortable taking the heatspreaders off. But, if they were both D9's, then why wouldn't they work together? Just doesn't make sense to me.

[DaedalusHelios]

I would check, but I am a little uncomfortable taking the heatspreaders off. But, if they were both D9's, then why wouldn't they work together? Just doesn't make sense to me.

There isn't one D9. Micron D9's are manufactured in different batches that meet different tolerances based on what product line they are made for. But some people say all D9's are made to high quality standards.;)

My Ballistix RAM I am using right now are D9's. They aren't extremely rare. They just aren't necessarily common.

[novacheck]

Gotcha, kind of makes more sense to me know. :D

[novacheck]

I am going to upload the SPD's for each ram. If anyone wants to look through them, and see if I can make them compatible, please feel free. I have looked through them with SPDTool, and most of the items are the same, however, there are a few differences. Memory is not an area where I shine, so I hope someone is willing to take a look through these.

[novacheck]

Well, to update. I just flashed a stick of the Transcend to the timings of the Corsair. I didn't want to do both sticks, as I didn't want to kill BOTH of them. I installed one stick of each in a non Dual-Channel setup, and booted on the first try. So, now I am going to try flashing the other one(thank god I am a stickler for backing up my work.), and see if I can get all 4 sticks running.

[novacheck]

Final update. It worked!!!!!!!! I will upload the modified SPD, so you can see the changes that I have made. Tell me if you think I will survive with them.

[DaedalusHelios]

Wow, nice ram. :D

What voltage?

[novacheck]

Wow, nice ram. :D

What voltage?Everything will work between 1.9, and 2.1 stable. I am running 1040mhz at 5-5-5-15, just to be safe for right now. I have noticed a pretty big boost in performance, so I may be happy with those settings for now.

[Frogger]

Gald to see that you got it to work !:toast: that spd tool can come in handy :)

[novacheck]

Yes, it can!!!! Just took me a couple of minutes too see what was different between the two sets, and bingo. It was only a few timing differences that was the main problem.

[francis511]

I`m running mixed sets on that same board with no problems, but glad to see your fix worked !

[novacheck]

Thats why it confused me. I have ran mixed sets in the past, with more differences than these had. So, I am glad I figured it out. Thanks guys, for all the help.